johnson



Dec. 22, 1925- 1,566,751

R. S. JOHNSON OVEN SIGNAL Filed Aug. 1925 2 Sheets-Sheet 1 Dec. 22,1925 1,566,751

R. S. JOHNSON OVEN SiGNAL Filed Aug. 1925 2 Sheets-Sheet 2 Zlwmyntoc Patented Dec. 22, 1925.

F f Brennan's. .ronnsorrfor 'YORK,PENNSYL-VA1}IIA.

" i ovm r SIGNAL: 1 I v I Application filedA ugust18, 1925.; Seria1 Koii51Q57,

To allwhom it may concern. i

Be it known that I, RICHARD S. JoHNsoN, a citizen of the United States, residing at York, in the county of. York and State of Pennsylvania, have invented certain new and useful Improvements in O-ven Signals, of which the following isa specification. This invention relates to signals, and more particularly to an alarm for .ovensand ,thelike. m p

An object of the invention is to provide an apparatus of this character that maybe set at the proper temperature for cook nga certain food and which will give a signal when this temperature is reached.

A further object o f the invention is the provisionof means for, giving a further signal if the temperature israised a predetermined amount above the temperature for, which the oven is originally set. i

A further objectof the invention is the provision of a thermostatically controlled numeral 1 ingwhich maybe of any desired shape, and

apparatus of this character which is simple in construction and by means of which the aboveresults may be obtained. Y

1 In the. accompanying drawings, I have Figure 1 is a side elevation Figure 2 is a front elevation, Figure3 is a'vertical sectional view substantlally on line 3- 3 of Figure 2, p

Figure 7s a pers pective view of one of the weights by means of which the signal apparatus is actuated,

Figure 5 isa horizontal sectional vie'won line 55 of Figure 3, a Y I Figure 6 is a vertical sectional view on line 6-6 of Figure 5,

Figure 7 isa similar view on line 7-7 ,of' Figure 5, and, v f p I Figure 8 is a perspective view of an actuating dog. 7 Referrin to the drawings, the reference designates generally an outer caswhich, as shown, is provided with a'curved or circular top 2. A handle 3 is securedto the top of the casing to permit theldevice to be moved from place to place. The casing ,7 is provided with a front, wall tand fur- 'ther. provided with a ;sloping'.rear ,wall 5 upon which a bell6 maybe arranged.

As shown, the front wallof the, casing is.

P vi d 'W t t b nd i f tm 'eg l cured to thebottom; ofthe casing, as at 12, andbowed. 4 The free end ofthe thermostatic jelem'ent vi's/providedwith a pair of vears .13 1 adapted to receive acat'chll mounted on a pin 15.: As shown (see Figure ,5), the ther- ;mounted in albracket 18, secured to the inwithin the bell. 6.

dial with the dial setting. the; apparatus I cooking various' foodsL' This; pointer is mounted onxa shaftor pin 9, fjournaled in casingand, s shown,,the thermostat is semostatic, element is of an appreciable "width and is adapted to, supporta pair'of catches 14. The thermostatic element is provided with {aicentrally disposed slot "16 adapted to receive a pivoted lever 17 which is pivotally ner side of the frontwall and the upper end of this lever is' provided with athr'eaded sleeve portion 19 adapted v to receive the threaded portion, of the 'pin- 9.' "The lower end, of-this 1- lever is connected to a a I frame 20 which extends rearwar'dly and-is shown one embodiment of the invention. In, this showing: 1 7

frame; The frame20 adaptedfto support we aisaresedate .60 threaded pOrtion lO arranged the mechanism by means ofwhich' the'bell or signal is actuated. As shownfth'erear portion thereof is of greater width than the front portion, the frame being provided with diverging side walls 22. Arranged ad-v jacent. the rear of these 'side t walls and at each sidelof' the frame, I providefvertical walls 23 adapted to'receive and support a shaft 24.1 A rat'cl et'whee1 25 ismoiintedion this shaftand is adaptedto actuate a pawl 26 having ahol'ding tooth 27 at one end and aftooth 28 atfthe opposite end adapted to be-engagedfbythe teeth of the ratchet, wheel when the ratchet. wl1ee1 ;revolves in a clock- Iwise direction -to vibrate the pawl. As

shown, thepawl is provided with an eXten-. sion 29'to which a clapper 30jis secured and thi clapper extends throughla slot131. in the sloping wall of the casing and {is} received Forwardly of thewalls 23,1 1 of 1 vertical; walls 32 which are spaced from I each other ,a less distance than thejrear walls ried by th sha t ne o the Pi meshes v'v'ith a pinion '35 carried by the shaft 24 of the ratchet wheel. V

On each side of the apparatus, Iprovide a weight 36 having .areduced rear portion 37 and'this reduced rear portion is provided with an opening 38 for the reception of a pivot pin 39 mounted in the correspond- 1 ing rear wa1l23. Adjacent its forward end,

the weightis reducedto provide a tooth 4O was to eengage by the catch 14, Each of the weights" is provided with i a laterally projecting pin41 on its inner side and these pins'l areadapted' (to receive an actuating leverf42, shown in Figure 8 of the drawings.

1s shown, the actuating lever is formed of a;pair ofplates extending on opposite sides thefgear 34 when'the lever H i v 48 is provided on each side of adjustment of th johtop of the oven therefrom, :i nay "be arranged Within 1 heated. The pointer 8 is catch 14.

bf the gear 34' and having openings :43 therein for-"the reception of the "shaft Ad? 1' acent the opposite end, each of these plates is provided with an elongated slot 44 for the reception of the pin 41. Eachofth'ese 'leversis thus pivotally mounted on the shaft .33- and is; controlled jby aweight, the lever bein lowered to thejdotted line position 3 of"the drawings, when shown in:F 1gure I 'the'jweight falls. Between the two plates foflfhe lever, I provide an actuating dog 45,

-jectsfthrough'each ofthese. slotsland is pro-1 a suitable handlehO. As shown,

permit longitudinal "adjust- [mer t of the rod when theframe is adjusted by means of' the pointer.

The operation of the device is as follows: "Theapparatus is adaptedto be arranged to be heated by radiation a chamber to be 'set' on the dial for the particular food to be cooked, In setting the pointer, the pin9 is rotated, caus- 19 to move, thus swinging 'ing the sleeve the lever 17 'on its pivot and adjusting the frame 20 longitudinallvof the casing. This 7 v i'frar'ne controls the lap of the tooth '40 carried by the weight and the The pin 22, riding in the elongated slot 21 formsa guide for the frame. Thewidth of the-slot 49 issufficient to'per the frame to. beadjusted any desired amount. I When the dial is set, the'weights "are lifted by means of the handles 50 to the full line-positionshown in Figure 3 of t th rawi g 'raisesf, thefthermostat expands and tends SP I sa i efi th pp nd'i h' s i' e il git ing'the 'weight 36." The 'weightthe'n swings As the heat of the oven th oo-f t i sil gah re e the slot} is of greater width or under some circumstances,

supporting member.

downwardly on; its pivot 39 ,carrying the actuating lever with and :asftlie actuating lever moves downwardly, thetooth' 47 .en

gages between a pair of teeth of the gear 34 revolving. the gear, and thus revolving the shaft 33. The pinion 35 on the shaft .24

is then revolved, revolving the ratchet wheel in a clockwise direction and causing the tooth 28 to ride over the teeth of the ratchet wheel to vibrate the clapper 30, as: indicated in dotted lines in Figure 3 of the drawings, and thus give asignal.

As shown in-Figure 5 of "the drawings,

this catch overlaps the tooth Itj is then desirable to maintain a constant heat in the oven and if a "certain flow of gasfhas been employedfor the purpose of heating the oven, less gas may benecessary for the purpose of maintaining this heat. The weight 36 *at the bottom of'Figure 5 of the drawings is adapted to be released f when the heat raises a given amount over the amount of heat necessary for cooking the particular food to give a secondsignal and thus info-rm the operator that the oven is becoming too hot. second signal is the same as heretofore 'de scribed' While the gear "34 corresponding to this signal is notin mesh with the pinion 35, revolution of this gear revolves the shaft '33 and thus revolves the otherpinion to actuate the shaft 24 and the ratchet wheel25. i Q

It is to be understood that theform of my invention herewith shown'and described is to be taken as a preferred example ofthe same,and that'various changes the-shape, size, and arrangement of parts ma be re sorted to without departing froin the. spirit of the invention or the scope of the subjoined claims.

I claim: I, i I 1. In a device ofthe oharacte rdescribed, a thermostat having a weight supporting member associated therewith, 'a'weighthaving a portion overhanging said wei'ghtsup porting memberto be supported thereon, a

device adapted to be ,operated; "by move ment' of said weight, a frame-carrying "sai to vary the overhang'of said weight'on said 2. Ina device of the character described. a casing, a dial arranged on said casing, a pointer "associated with said dial, a thermostat arranged in said casing,a weight The operation of the one of the catches 14 1s slightly longer than the other and forany' given'ad uStHient of' the pointer, 40a greater distance than the otherlcatch. .The weight at the top of Figure 5*0fthe drawings willthus be released first and the food to be cooked is then placed in the oven.

,1 weight, and means for adjusting said frame supporting m'ember carri'ed byia lportion of said'thermostat,a weightj'arranged insaid no c'asingjand having a lip overhanging-said said weight, said weight supporting member being movable away from said weight with the portion of said thermostat by which it is carried as the latter moves under the influence of increasing temperatures, a frame mounted in said casing and carrying said weight, said frame being adjustable to move said weight toward and away from said weight supporting member to vary the over hang of said lip on said weight suporting member, and means connected between said pointer and said frame for adjusting the latter according to the position of said pointer.

3. A device constructed in accordance with claim 2 wherein said means includes a lever pivotally mounted intermediate its ends and connected at its ends to said pointer and said frame respectively. I

4:; In a device of the character described, a casing, a thermostat mounted in said casing, a movable frame mounted in said casing, a weight pivoted on said frame and controlled by said thermostat, an actuating dog carried bysaid weight, a shaft mounted adjacent said weight, a gear mounted on said shaft, and adapted to be actuated by said dog, a ratchet wheel operatively connected to said shaft, and a bell adapted to be actuated thereby.

5. A device constructed in accordance with claim 4 wherein a'pivoted lever is connected to said weight and said actuating dog" is carried by said pivoted lever.

6. A device constructed in accordance with claim 4 wherein a dial is provided on said casing and a pointer is arranged over said dial, said pointer being connected to said frame to adjust said frame when said pointer is moved.

7. In a device of the character described, a casing, a thermostat mounted in said casing, a movable frame mounted in said casing, a pair of weights pivotally mounted on said frame, catches carried by said thermostat and engaging said weights, one of said catches being longer than the other whereby -a greater raisein temperature is necessary to release theweight connected therewith, and a signal adapted to be operated by the release of either ofsaid weights.

8. In a device of the character described,

a casing, athermostat mounted in said casing, a movable frame mounted in'said casing, a pair of weights pivotally mounted on said frame, catches carried by said thermostat and engaging said weights, said catches being so arranged that one of said weights will be released at a lower temperature than the other one, and a signal adapted to be operated by the release of either of said weights.

In testimony ture.

whereof, aflix my signa- RIGI-IARD S. JOHNSON. 

